Kim Jong Un is reportedly burying his secrets. Literally.

North Korea leader Kim Jong Un and his predecessors reportedly buried papers and photographs underground, two anonymous North Korean sources confirmed to Daily NK, a Seoul-based news site.

"Initially they store it in a Pyongyang archive, and after some time has passed they will pick out what requires permanent storage and then transfer papers and photographs to the underground storage center in Jagang Province," one source said.

The papers, which have reportedly been stored in the guarded, temperature-controlled archives starting in 1974, apparently include detailed records on who Kim Jong Un, Kim Jong Il, and Kim Il Song have punished and killed for which crimes.

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